1; RUN: opt -instcombine -S < %s | FileCheck %s 2 3target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4target triple = "x86_64-unknown-linux-gnu" 5 6; If all the operands to a phi node are of the same operation, instcombine 7; will try to pull them through the phi node, combining them into a single 8; operation. Check that when it does this the combined operation has a merged 9; debug location. 10 11; Test folding of a binary operation. Generated from source: 12 13; extern int foo(void); 14; extern int bar(void); 15; 16; int binop(int a, int b) { 17; if(a) 18; b -= foo(); 19; else 20; b -= bar(); 21; return b; 22; } 23 24; CHECK: define i32 @binop 25; CHECK-LABEL: if.end: 26; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ] 27; CHECK: sub nsw i32 %b, %[[PHI]], !dbg [[binopMergedLoc:![0-9]+]] 28; CHECK: ret i32 29 30define i32 @binop(i32 %a, i32 %b) !dbg !6 { 31entry: 32 %tobool = icmp ne i32 %a, 0, !dbg !8 33 br i1 %tobool, label %if.then, label %if.else, !dbg !8 34 35if.then: ; preds = %entry 36 %call = call i32 @foo(), !dbg !9 37 %sub = sub nsw i32 %b, %call, !dbg !10 38 br label %if.end, !dbg !11 39 40if.else: ; preds = %entry 41 %call1 = call i32 @bar(), !dbg !12 42 %sub2 = sub nsw i32 %b, %call1, !dbg !13 43 br label %if.end 44 45if.end: ; preds = %if.else, %if.then 46 %b.addr.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ] 47 ret i32 %b.addr.0, !dbg !14 48} 49 50; Test folding of a compare. Generated from source (with editing to 51; common the zext): 52 53; extern int foo(void); 54; extern int bar(void); 55; 56; int cmp(int a, int b) { 57; int r; 58; if(a) 59; r = foo() < b; 60; else 61; r = bar() < b; 62; return r; 63; } 64 65; CHECK: define i32 @cmp 66; CHECK-LABEL: if.end: 67; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ] 68; CHECK: icmp slt i32 %[[PHI]], %b, !dbg [[cmpMergedLoc:![0-9]+]] 69; CHECK: ret i32 70 71define i32 @cmp(i32 %a, i32 %b) !dbg !15 { 72entry: 73 %tobool = icmp ne i32 %a, 0, !dbg !16 74 br i1 %tobool, label %if.then, label %if.else, !dbg !16 75 76if.then: ; preds = %entry 77 %call = call i32 @foo(), !dbg !17 78 %cmp = icmp slt i32 %call, %b, !dbg !18 79 br label %if.end, !dbg !19 80 81if.else: ; preds = %entry 82 %call1 = call i32 @bar(), !dbg !20 83 %cmp2 = icmp slt i32 %call1, %b, !dbg !21 84 br label %if.end 85 86if.end: ; preds = %if.else, %if.then 87 %r.0 = phi i1 [ %cmp, %if.then ], [ %cmp2, %if.else ] 88 %conv = zext i1 %r.0 to i32 89 ret i32 %conv, !dbg !22 90} 91 92; Test folding of getelementptr. Generated from source: 93 94; extern long long foo2(void); 95; extern long long bar2(void); 96; 97; int *gep(int a, int *b) { 98; int *r; 99; if(a) 100; r = &b[foo2()]; 101; else 102; r = &b[bar2()]; 103; return p; 104; } 105 106; CHECK: define i32* @gep 107; CHECK-LABEL: if.end: 108; CHECK: %[[PHI:.*]] = phi i64 [ %call, %if.then ], [ %call1, %if.else ] 109; CHECK: getelementptr inbounds i32, i32* %b, i64 %[[PHI]], !dbg [[gepMergedLoc:![0-9]+]] 110; CHECK: ret i32* 111 112define i32* @gep(i32 %a, i32* %b) !dbg !23 { 113entry: 114 %tobool = icmp ne i32 %a, 0, !dbg !24 115 br i1 %tobool, label %if.then, label %if.else, !dbg !24 116 117if.then: ; preds = %entry 118 %call = call i64 @foo2(), !dbg !25 119 %arrayidx = getelementptr inbounds i32, i32* %b, i64 %call, !dbg !26 120 br label %if.end, !dbg !27 121 122if.else: ; preds = %entry 123 %call1 = call i64 @bar2(), !dbg !28 124 %arrayidx2 = getelementptr inbounds i32, i32* %b, i64 %call1, !dbg !29 125 br label %if.end 126 127if.end: ; preds = %if.else, %if.then 128 %r.0 = phi i32* [ %arrayidx, %if.then ], [ %arrayidx2, %if.else ] 129 ret i32* %r.0, !dbg !30 130} 131 132; Test folding of load. Generated from source: 133 134; extern int *foo3(void); 135; extern int *bar3(void); 136; 137; int load(int a) { 138; int r; 139; if(a) 140; r = *foo3(); 141; else 142; r = *bar3(); 143; return r; 144; } 145 146; CHECK: define i32 @load 147; CHECK-LABEL: if.end: 148; CHECK: %[[PHI:.*]] = phi i32* [ %call, %if.then ], [ %call1, %if.else ] 149; CHECK: load i32, i32* %[[PHI]],{{.*}} !dbg [[loadMergedLoc:![0-9]+]] 150; CHECK: ret i32 151 152define i32 @load(i32 %a) !dbg !31 { 153entry: 154 %tobool = icmp ne i32 %a, 0, !dbg !32 155 br i1 %tobool, label %if.then, label %if.else, !dbg !32 156 157if.then: ; preds = %entry 158 %call = call i32* @foo3(), !dbg !33 159 %0 = load i32, i32* %call, align 4, !dbg !34 160 br label %if.end, !dbg !35 161 162if.else: ; preds = %entry 163 %call1 = call i32* @bar3(), !dbg !36 164 %1 = load i32, i32* %call1, align 4, !dbg !37 165 br label %if.end 166 167if.end: ; preds = %if.else, %if.then 168 %r.0 = phi i32 [ %0, %if.then ], [ %1, %if.else ] 169 ret i32 %r.0, !dbg !38 170} 171 172; Test folding of a cast. Generated from source: 173 174; extern int foo(void); 175; extern int bar(void); 176; 177; long long cast(int a) { 178; long long r; 179; if(a) 180; r = foo(); 181; else 182; r = bar(); 183; return r; 184; } 185 186; CHECK: define i64 @cast 187; CHECK-LABEL: if.end: 188; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ] 189; CHECK: sext i32 %[[PHI]] to i64, !dbg [[castMergedLoc:![0-9]+]] 190; CHECK: ret i64 191 192define i64 @cast(i32 %a) !dbg !39 { 193entry: 194 %tobool = icmp ne i32 %a, 0, !dbg !40 195 br i1 %tobool, label %if.then, label %if.else, !dbg !40 196 197if.then: ; preds = %entry 198 %call = call i32 @foo(), !dbg !41 199 %conv = sext i32 %call to i64, !dbg !41 200 br label %if.end, !dbg !42 201 202if.else: ; preds = %entry 203 %call1 = call i32 @bar(), !dbg !43 204 %conv2 = sext i32 %call1 to i64, !dbg !43 205 br label %if.end 206 207if.end: ; preds = %if.else, %if.then 208 %r.0 = phi i64 [ %conv, %if.then ], [ %conv2, %if.else ] 209 ret i64 %r.0, !dbg !44 210} 211 212; Test folding of a binary op with a RHS constant. Generated from source: 213 214; extern int foo(void); 215; extern int bar(void); 216; 217; int binop_const(int a) { 218; int r; 219; if(a) 220; r = foo() - 5; 221; else 222; r = bar() - 5; 223; return r; 224; } 225 226; CHECK: define i32 @binop_const 227; CHECK-LABEL: if.end: 228; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ] 229; CHECK: add nsw i32 %[[PHI]], -5, !dbg [[binopConstMergedLoc:![0-9]+]] 230; CHECK: ret i32 231 232define i32 @binop_const(i32 %a) !dbg !45 { 233entry: 234 %tobool = icmp ne i32 %a, 0, !dbg !46 235 br i1 %tobool, label %if.then, label %if.else, !dbg !46 236 237if.then: ; preds = %entry 238 %call = call i32 @foo(), !dbg !47 239 %sub = sub nsw i32 %call, 5, !dbg !48 240 br label %if.end, !dbg !49 241 242if.else: ; preds = %entry 243 %call1 = call i32 @bar(), !dbg !50 244 %sub2 = sub nsw i32 %call1, 5, !dbg !51 245 br label %if.end 246 247if.end: ; preds = %if.else, %if.then 248 %r.0 = phi i32 [ %sub, %if.then ], [ %sub2, %if.else ] 249 ret i32 %r.0, !dbg !52 250} 251 252; Test folding of a compare with RHS constant. Generated from source (with 253; editing to common the zext): 254 255; extern int foo(void); 256; extern int bar(void); 257; 258; int cmp_const(int a) { 259; int r; 260; if(a) 261; r = foo() < 10; 262; else 263; r = bar() < 10; 264; return r; 265; } 266 267; CHECK: define i32 @cmp_const 268; CHECK-LABEL: if.end: 269; CHECK: %[[PHI:.*]] = phi i32 [ %call, %if.then ], [ %call1, %if.else ] 270; CHECK: icmp slt i32 %[[PHI]], 10, !dbg [[cmpConstMergedLoc:![0-9]+]] 271; CHECK: ret i32 272 273define i32 @cmp_const(i32 %a) !dbg !53 { 274entry: 275 %tobool = icmp ne i32 %a, 0, !dbg !54 276 br i1 %tobool, label %if.then, label %if.else, !dbg !54 277 278if.then: ; preds = %entry 279 %call = call i32 @foo(), !dbg !55 280 %cmp = icmp slt i32 %call, 10, !dbg !56 281 br label %if.end, !dbg !57 282 283if.else: ; preds = %entry 284 %call1 = call i32 @bar(), !dbg !58 285 %cmp2 = icmp slt i32 %call1, 10, !dbg !59 286 br label %if.end 287 288if.end: ; preds = %if.else, %if.then 289 %r.0 = phi i1 [ %cmp, %if.then ], [ %cmp2, %if.else ] 290 %conv = zext i1 %r.0 to i32 291 ret i32 %conv, !dbg !60 292} 293 294declare i32 @foo() 295declare i32 @bar() 296declare i64 @foo2() 297declare i64 @bar2() 298declare i32* @foo3() 299declare i32* @bar3() 300 301; CHECK: [[binopMergedLoc]] = !DILocation(line: 0 302; CHECK: [[cmpMergedLoc]] = !DILocation(line: 0 303; CHECK: [[gepMergedLoc]] = !DILocation(line: 0 304; CHECK: [[loadMergedLoc]] = !DILocation(line: 0 305; CHECK: [[castMergedLoc]] = !DILocation(line: 0 306; CHECK: [[binopConstMergedLoc]] = !DILocation(line: 0 307; CHECK: [[cmpConstMergedLoc]] = !DILocation(line: 0 308 309!llvm.dbg.cu = !{!0} 310!llvm.module.flags = !{!3, !4} 311 312!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2) 313!1 = !DIFile(filename: "test.c", directory: "") 314!2 = !{} 315!3 = !{i32 2, !"Dwarf Version", i32 4} 316!4 = !{i32 2, !"Debug Info Version", i32 3} 317!6 = distinct !DISubprogram(name: "binop", scope: !1, file: !1, line: 8, type: !7, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 318!7 = !DISubroutineType(types: !2) 319!8 = !DILocation(line: 9, column: 6, scope: !6) 320!9 = !DILocation(line: 10, column: 10, scope: !6) 321!10 = !DILocation(line: 10, column: 7, scope: !6) 322!11 = !DILocation(line: 10, column: 5, scope: !6) 323!12 = !DILocation(line: 12, column: 10, scope: !6) 324!13 = !DILocation(line: 12, column: 7, scope: !6) 325!14 = !DILocation(line: 13, column: 3, scope: !6) 326!15 = distinct !DISubprogram(name: "cmp", scope: !1, file: !1, line: 16, type: !7, isLocal: false, isDefinition: true, scopeLine: 16, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 327!16 = !DILocation(line: 18, column: 6, scope: !15) 328!17 = !DILocation(line: 19, column: 9, scope: !15) 329!18 = !DILocation(line: 19, column: 15, scope: !15) 330!19 = !DILocation(line: 19, column: 5, scope: !15) 331!20 = !DILocation(line: 21, column: 9, scope: !15) 332!21 = !DILocation(line: 21, column: 15, scope: !15) 333!22 = !DILocation(line: 22, column: 3, scope: !15) 334!23 = distinct !DISubprogram(name: "gep", scope: !1, file: !1, line: 25, type: !7, isLocal: false, isDefinition: true, scopeLine: 25, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 335!24 = !DILocation(line: 27, column: 6, scope: !23) 336!25 = !DILocation(line: 28, column: 12, scope: !23) 337!26 = !DILocation(line: 28, column: 10, scope: !23) 338!27 = !DILocation(line: 28, column: 5, scope: !23) 339!28 = !DILocation(line: 30, column: 12, scope: !23) 340!29 = !DILocation(line: 30, column: 10, scope: !23) 341!30 = !DILocation(line: 31, column: 3, scope: !23) 342!31 = distinct !DISubprogram(name: "load", scope: !1, file: !1, line: 34, type: !7, isLocal: false, isDefinition: true, scopeLine: 34, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 343!32 = !DILocation(line: 36, column: 6, scope: !31) 344!33 = !DILocation(line: 37, column: 10, scope: !31) 345!34 = !DILocation(line: 37, column: 9, scope: !31) 346!35 = !DILocation(line: 37, column: 5, scope: !31) 347!36 = !DILocation(line: 39, column: 10, scope: !31) 348!37 = !DILocation(line: 39, column: 9, scope: !31) 349!38 = !DILocation(line: 40, column: 3, scope: !31) 350!39 = distinct !DISubprogram(name: "cast", scope: !1, file: !1, line: 43, type: !7, isLocal: false, isDefinition: true, scopeLine: 43, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 351!40 = !DILocation(line: 45, column: 6, scope: !39) 352!41 = !DILocation(line: 46, column: 9, scope: !39) 353!42 = !DILocation(line: 46, column: 5, scope: !39) 354!43 = !DILocation(line: 48, column: 9, scope: !39) 355!44 = !DILocation(line: 49, column: 3, scope: !39) 356!45 = distinct !DISubprogram(name: "binop_const", scope: !1, file: !1, line: 52, type: !7, isLocal: false, isDefinition: true, scopeLine: 52, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 357!46 = !DILocation(line: 54, column: 6, scope: !45) 358!47 = !DILocation(line: 55, column: 9, scope: !45) 359!48 = !DILocation(line: 55, column: 15, scope: !45) 360!49 = !DILocation(line: 55, column: 5, scope: !45) 361!50 = !DILocation(line: 57, column: 9, scope: !45) 362!51 = !DILocation(line: 57, column: 15, scope: !45) 363!52 = !DILocation(line: 58, column: 3, scope: !45) 364!53 = distinct !DISubprogram(name: "cmp_const", scope: !1, file: !1, line: 61, type: !7, isLocal: false, isDefinition: true, scopeLine: 61, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2) 365!54 = !DILocation(line: 63, column: 6, scope: !53) 366!55 = !DILocation(line: 64, column: 9, scope: !53) 367!56 = !DILocation(line: 64, column: 15, scope: !53) 368!57 = !DILocation(line: 64, column: 5, scope: !53) 369!58 = !DILocation(line: 66, column: 9, scope: !53) 370!59 = !DILocation(line: 66, column: 15, scope: !53) 371!60 = !DILocation(line: 67, column: 3, scope: !53) 372